package com.webserver.controller;

import com.webserver.annotation.Controller;
import com.webserver.annotation.RequestMapping;
import com.webserver.core.DispatcherServlet;
import com.webserver.entity.User;
import com.webserver.http.HttpServletRequest;
import com.webserver.http.HttpServletResponse;

import java.io.*;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;

@Controller
public class UserController {
    private static File userDir;

    static{
        userDir = new File("./users");
        if(!userDir.exists()){
            userDir.mkdirs();
        }
    }

    @RequestMapping("/myweb/reg")
    public void reg(HttpServletRequest request, HttpServletResponse response){
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String nickname = request.getParameter("nickname");
        String ageStr = request.getParameter("age");

        if(username==null || password==null || nickname==null || ageStr==null || !ageStr.matches("[0-9]+")){
            response.sendRedirect("/myweb/reg_input_error.html");
            return;
        }
        int age = Integer.parseInt(ageStr);
        System.out.println(username+","+password+","+nickname+","+ageStr);

        File userFile = new File(userDir,username+".obj");
        if(userFile.exists()){

            response.sendRedirect("/myweb/have_user.html");
            return;
        }
        try (
                FileOutputStream fos = new FileOutputStream(userFile);
                ObjectOutputStream oos = new ObjectOutputStream(fos);
        ){
            User user = new User(username,password,nickname,age);
            oos.writeObject(user);

            response.sendRedirect("/myweb/reg_success.html");

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    @RequestMapping("/myweb/login")
    public void login(HttpServletRequest request,HttpServletResponse response){
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        if(username==null || password==null){
            response.sendRedirect("/myweb/login_info_error.html");
            return;
        }

        File userFile = new File(userDir,username+".obj");
        if(userFile.exists()){
            try (
                 FileInputStream fis = new FileInputStream(userFile);
                 ObjectInputStream ois = new ObjectInputStream(fis);
            ){
                User user = (User)ois.readObject();
                if(user.getPassword().equals(password)){
                    response.sendRedirect("/myweb/login_success.html");
                    return;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        response.sendRedirect("/myweb/login_fail.html");

    }

    @RequestMapping("/myweb/showAllUser")
    public void showAllUser(HttpServletRequest request,HttpServletResponse response){
        List<User> userList = new ArrayList<>();
        File[] users = userDir.listFiles(f->f.getName().endsWith(".obj"));
        for (File userFile : users) {
            try (
                    FileInputStream fis = new FileInputStream(userFile);
                    ObjectInputStream ois = new ObjectInputStream(fis);
            ) {
                userList.add((User)ois.readObject());
            } catch (Exception e) {
                e.printStackTrace();
            }

        }

        PrintWriter pw = response.getWriter();
        pw.println("<!DOCTYPE html>");
        pw.println("<html lang=\"en\">");
        pw.println("<head>");
        pw.println("<meta charset=\"UTF-8\">");
        pw.println("<title>用户列表</title>");
        pw.println("</head>");
        pw.println("<body>");
        pw.println("<center>");
        pw.println("<h1>用户列表</h1>");
        pw.println("<table border=\"1\">");
        pw.println("<tr>");
        pw.println("<td>用户名</td>");
        pw.println("<td>密码</td>");
        pw.println("<td>昵称</td>");
        pw.println("<td>年龄</td>");
        pw.println("<td>操作</td>");
        pw.println("</tr>");
        for(User user : userList){
            pw.println("<tr>");
            pw.println("<td>"+user.getUsername()+"</td>");
            pw.println("<td>"+user.getPassword()+"</td>");
            pw.println("<td>"+user.getNickname()+"</td>");
            pw.println("<td>"+user.getAge()+"</td>");
            pw.println("<td><a href='/myweb/deleteUser?username="+user.getUsername()+"'>删除</a></td>");
            pw.println("</tr>");
        }
        pw.println("</table>");
        pw.println("</center>");
        pw.println("</body>");
        pw.println("</html>");

        response.setContentType("text/html");
    }

    @RequestMapping("/myweb/deleteUser")
    public void deleteUser(HttpServletRequest request,HttpServletResponse response){
        String username = request.getParameter("username");

        File userFile = new File(userDir,username+".obj");
        userFile.delete();

        response.sendRedirect("/myweb/showAllUser");

    }

}
